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<!--
Bug 1068144 - Test getting the timestamps for allocations.
-->
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  <meta charset="utf-8">
  <title>Memory monitoring actor test</title>
  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
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<pre id="test">
<script src="memory-helpers.js" type="application/javascript;version=1.8"></script>
<script>
window.onload = function() {
  SimpleTest.waitForExplicitFinish();

  Task.spawn(function* () {
    var { memory, client } = yield startServerAndGetSelectedTabMemory();
    yield memory.attach();

    var allocs = [];
    function allocator() {
      allocs.push(new Object);
    }

    // Using setTimeout results in wildly varying delays that make it hard to
    // test our timestamps and results in intermittent failures. Instead, we
    // actually spin an empty loop for a whole millisecond.
    function actuallyWaitOneWholeMillisecond() {
      var start = window.performance.now();
      while (window.performance.now() - start < 1.000) ;
    }

    yield memory.startRecordingAllocations();

    allocator();
    actuallyWaitOneWholeMillisecond();
    allocator();
    actuallyWaitOneWholeMillisecond();
    allocator();

    var response = yield memory.getAllocations();
    yield memory.stopRecordingAllocations();

    ok(response.allocationsTimestamps, "The response should have timestamps.");
    is(response.allocationsTimestamps.length, response.allocations.length,
       "There should be a timestamp for every allocation.");

    var allocatorIndices = response.allocations
      .map(function (a, idx) {
        var frame = response.frames[a];
        if (frame && frame.functionDisplayName === "allocator") {
          return idx;
        }
      })
      .filter(function (idx) {
        return idx !== undefined;
      });

    is(allocatorIndices.length, 3, "Should have our 3 allocations from the `allocator` timeouts.");

    var lastTimestamp;
    for (var i = 0; i < 3; i++) {
      var timestamp = response.allocationsTimestamps[allocatorIndices[i]];
      info("timestamp", timestamp);
      ok(timestamp, "We should have a timestamp for the `allocator` allocation.");

      if (lastTimestamp) {
        var delta = timestamp - lastTimestamp;
        info("delta since last timestamp", delta);
        // If we're unlucky, we might have rounded down to 0ms
        // ok(delta >= 1 /* ms */,
        //   "The timestamp should be about 1 ms after the last timestamp.");
      }

      lastTimestamp = timestamp;
    }

    yield memory.detach();
    destroyServerAndFinish(client);
  });
};
</script>
</pre>
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